Abstract:
The invention relates to an image for detection of an aerial pattern comprising spatial differences in radiation intensity in a cross section of a beam of radiation in a lithographic apparatus for exposing a substrate. The image sensor comprises a lens arranged to form a detection image of the aerial pattern and an image detector arranged to measure radiation intensities in a plurality of positions in the detection image.
Abstract:
The invention relates to an image for detection of an aerial pattern comprising spatial differences in radiation intensity in a cross section of a beam of radiation in a lithographic apparatus for exposing a substrate. The image sensor comprises a lens (5) arranged to form a detection image of the aerial pattern and an image detector (6) arranged to measure radiation intensities in- a plurality, of positions in the detection image.